Presenting Your Opinion

Namely: Namely, Australia and Canada have many charity organisations which work exactly for this cause.
To illustrate: To illustrate, universities, these days, offer a wide range of subjects than they used to do in the past.
One clear example: One clear example would be my sister who, despite her graduation in mathematics, works as a journalist in a daily newspaper.
In other words: In other words, fathers should share these responsibilities and let mothers enjoy some leisure hours. [N.B. Use this expression (i.e. in other words) to express or point something in a different way, to make it easier, clear and to emphasise.]
To give an example: To give an example, modern household appliances and kitchenware have made the cooking process easier and faster.

Listing Points: 

First/ Firstly/ To begin with:
First, public transportations are cheap and can carry many passengers at a time.
Firstly, increasing the fuel price would affect the daily budget of all citizens.
To begin with, old people has paid taxes and worked for the country for their whole life.
Second/ Secondly:
Second(ly), we do not have to worry about parking, garage, traffic rule violation and fuel cost when we do not own a car.
Third(ly)... Fourth(ly):
Third(ly), smoking does not have a single benefit but a pile of disadvantages.
Fourth(ly), ever increasing population is a reason for increased house rent, competitive job market and pollution.
Lastly/ Finally/ Last but not least:
Lastly, the rail is one of the safest transportation systems that can carry a huge number of passengers at a time.
Finally, parents spend more time with their children than a teacher does.
Last but not least, countries like Bangladesh, India, Pakistan and Nepal prove that violence and crime can be in a peak even under the woman leadership.

Reasons and Causes: